"Children of the air", "heaven aces", "forerunners of the weather" - Swifts have a lot of different names.Swift - a star of aerial acrobatics.It is very exciting to watch the flights of swifts when they gather in a huge flock of hundreds and rush across the sky swirl with amazing agility.Theoretical calculations indicate that the flight Swift perfect.
Celestial aces, in addition, are unsurpassed architects.Nature has endowed these wonderful birds unique salivary glands.The fluid, which is released salivary glands, contains a lot of protein.In the air the protein is transformed into concreting composition.Swift - the most familiar to us inhabitants of the city.He collects material for nest building on the fly, catches poplar fluff, paper scraps, others raised into the air by the wind debris, glues it all his saliva and builds a cup-shaped housing somewhere under the eaves of the attic.Each house is created creatively and individually designed feathered family.
Bird Swift rarely falls on the solid earth, because her legs are short and are not suitable even for sitting on the branches.Standing on the ground, deprived of the opportunity to make a swift enough beating of wings to fly.But it can be very easy to catch their claws for the steep rock or stone wall and a tall house with curiosity to see the world from above.
Why Swift called the harbinger of the weather and what to feed Swift at home?Swift powered "air plankton" that is, small insects and their larvae, which rises into the air warm and strong wind.Warm up in the sun, atmospheric flows sharply rises.Mote can not withstand the force of the wind and fly through the air, forming plankton.This natural feature is vital for swifts.Their life is always dependent on the weather and wind power.When there is no wind, the black swift calm.As soon as the wind blew, carrying the rain clouds, the birds begin to flutter and write amazing pretzel in the air.Seeing this, people immediately understand that this swifts they portend rain.
In cold weather swifts never returned from the southern countries.Depending on the weather sometimes their flight lasts only eighteen days, and sometimes - all twenty-seven.But if martins arrived, the people rejoice because their wings and flies stable warm weather.And there is no mystery.Just they fly to nesting, adhering to movement of the cyclone, because in a way they need food.Insects begin to multiply only in warm weather, so the martins chosen flight path between heat and counter strong winds.
returning to the place of nesting black swift break from the complex and long flight just one day and immediately begins to rebuild its nest or build new.In the arrangement takes about a week.The new nest once the eggs are laid.Raise offspring, swifts again will gather for the winter in the distant Africa, crossing the equator, and the time of their departure necessarily be associated with the change of weather conditions.
